Test: cts: Drop -w option from cts script

The -w (watch) option uses the cts script as a glorified grep wrapper.
It runs tail -F on a log file that's hard coded based on the provided
cluster name (or based on the custom cluster creation prompts from
earlier in this command). It greps for lines containing "CTS:" and any
other patterns that the user provides with the "-e" option. It excludes
lines with "debug:" and "cmd:" based on the -v (verbosity) option.

These are things that a user can easily do on their own without the use
of this script. This is especially true since the hard-coded log file
has no reason to exist unless the user had read this script and passed
that log file name to their cts-lab run.

Signed-off-by: Reid Wahl <nrwahl@protonmail.com>